Create a dataclass for indexer worker TaskStatus (#4601)

* #4534 -Created a dataclass for indexer worker TaskStatus

* Made types more precise in dataclass for indexer worker TaskStatus as suggested

* Changed timestamps to float and type of progress, finish_time to Synchronized

* Use `Synchronized[float]` type

---------

Co-authored-by: Krystle Salazar <github@krysal.co>

indexer_worker/indexer_worker/tasks.py

@@ -1,9 +1,14 @@
 """Simple in-memory tracking of executed tasks."""
 
+from __future__ import annotations
+
 import datetime
+from dataclasses import dataclass
+from multiprocessing.sharedctypes import Synchronized
+from typing import Any
 
 
-def _time_fmt(timestamp: int) -> str | None:
+def _time_fmt(timestamp: float) -> str | None:
     """
     Format the timestamp into a human-readable date and time notation.
 
@@ -16,6 +21,16 @@ def _time_fmt(timestamp: int) -> str | None:
     return str(datetime.datetime.utcfromtimestamp(timestamp))
 
 
+@dataclass
+class TaskInfo:
+    task: Any
+    start_time: float
+    model: str
+    target_index: str
+    finish_time: Synchronized[float]
+    progress: Synchronized[float]
+
+
 class TaskTracker:
     def __init__(self):
         self.tasks = {}
@@ -27,9 +42,11 @@ def add_task(self, task_id: str, **kwargs):
         :param task: the task being performed
         :param task_id: the UUID of the task
         """
-        self.tasks[task_id] = {
-            "start_time": datetime.datetime.utcnow().timestamp(),
-        } | kwargs
+        task_info = TaskInfo(
+            start_time=datetime.datetime.utcnow().timestamp(), **kwargs
+        )
+
+        self.tasks[task_id] = task_info
 
     def get_task_status(self, task_id: str) -> dict:
         """
@@ -39,12 +56,12 @@ def get_task_status(self, task_id: str) -> dict:
         :return: response dictionary containing all relevant info about the task
         """
         task_info = self.tasks[task_id]
-        active = task_info["task"].is_alive()
-        model = task_info["model"]
-        target_index = task_info["target_index"]
-        start_time = task_info["start_time"]
-        finish_time = task_info["finish_time"].value
-        progress = task_info["progress"].value
+        active = task_info.task.is_alive()
+        model = task_info.model
+        target_index = task_info.target_index
+        start_time = task_info.start_time
+        finish_time = task_info.finish_time.value
+        progress = task_info.progress.value
 
         return {
             "task_id": task_id,